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Related Experiment Video

Updated: May 13, 2026

Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films

Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films

Published on: August 18, 2018

Thin liquid film flow over substrates with two topographical features.

A Mazloomi¹, A Moosavi

¹Center of Excellence in Energy Conversion (CEEC), School of Mechanical Engineering, Sharif University of Technology, Azadi Avenue, P. O. Box 11365-9567, Tehran, Iran.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 19, 2013

Summary

This study reveals critical groove widths for successful surface coating of substrates with thin liquid films. Coating depends on groove geometry, depth, liquid properties, and spacing.

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Area of Science:

Fluid dynamics
Surface science
Computational physics

Background:

Surface topography significantly influences liquid film coating behavior.
Understanding coating dynamics is crucial for applications like microfluidics and material science.
Gravity-driven thin film flow presents unique challenges for filling complex geometries.

Purpose of the Study:

To investigate the surface coating of substrates with U- and V-shaped topographical features using a thin liquid film.
To determine critical parameters governing successful coating of grooves and mounds.
To analyze the influence of groove geometry, depth, capillary number, and contact angle on coating.

Main Methods:

A multicomponent lattice Boltzmann scheme was employed for numerical simulations.
The study simulated gravity-driven thin liquid film flow over substrates with defined topographical features.
Systematic variation of geometric parameters and fluid properties was performed.

Main Results:

Critical groove widths were identified for successful coating; exceeding this width ensures complete filling.
The critical width is dependent on capillary number, contact angle, and groove geometry/depth.
For double grooves, the second groove's critical width is influenced by the first, and a critical distance is necessary for partial filling.

Conclusions:

Successful surface coating of topographical features is governed by specific critical geometric and fluid parameters.
The interplay between groove geometry, liquid properties, and spacing dictates coating success.
The findings provide insights into optimizing surface coating processes for complex topographies.